diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tpiu.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tpiu.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c index 15dd01f8c197..0a55fd3b0efa 100644 --- a/drivers/hwtracing/coresight/coresight-tpiu.c +++ b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -12,6 +12,7 @@ * GNU General Public License for more details. */ +#include <linux/atomic.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/device.h> @@ -75,13 +76,13 @@ static void tpiu_enable_hw(struct tpiu_drvdata *drvdata) CS_LOCK(drvdata->base); } -static int tpiu_enable(struct coresight_device *csdev, u32 mode) +static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused) { struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); tpiu_enable_hw(drvdata); - - dev_info(drvdata->dev, "TPIU enabled\n"); + atomic_inc(csdev->refcnt); + dev_dbg(drvdata->dev, "TPIU enabled\n"); return 0; } @@ -101,13 +102,17 @@ static void tpiu_disable_hw(struct tpiu_drvdata *drvdata) CS_LOCK(drvdata->base); } -static void tpiu_disable(struct coresight_device *csdev) +static int tpiu_disable(struct coresight_device *csdev) { struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + if (atomic_dec_return(csdev->refcnt)) + return -EBUSY; + tpiu_disable_hw(drvdata); - dev_info(drvdata->dev, "TPIU disabled\n"); + dev_dbg(drvdata->dev, "TPIU disabled\n"); + return 0; } static const struct coresight_ops_sink tpiu_sink_ops = { @@ -168,10 +173,8 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) desc.pdata = pdata; desc.dev = dev; drvdata->csdev = coresight_register(&desc); - if (IS_ERR(drvdata->csdev)) - return PTR_ERR(drvdata->csdev); - return 0; + return PTR_ERR_OR_ZERO(drvdata->csdev); } #ifdef CONFIG_PM |